On 07.10.16 17:37, Guido van Rossum wrote:
On Fri, Oct 7, 2016 at 6:36 AM, Serhiy Storchaka <storch...@gmail.com> wrote:
A number of builtin iterator classes (but not all builtin iterator classes)
are registered with the Iterator ABC in Lib/_collections_abc.py. But
isinstance(it, Iterable) check works without explicit registration, because
Iterable has __subclasshook__ that checks iterator methods. Is there a need
in explicit registrations? Or their can be safely removed?
The preferred apprach is actually inheritance; registration comes
next; the __subclasshook__ is a final compromise to the tradition of
duck typing. I think the registrations should stay.
Should we register missed builtin iterators? For example longrange_iterator.
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